Attachment for jolt-ramming molding-machines



w. c. NORCROSS. ATTACHMENT FOR JOLT RAMMING MOLDING MA CHINES. APPLICATION FILED FEB. 10, I919.

1,31 6,502. Patented Sept. 16, 1919.

THE COLUMBIA PLANOORAPH (10.. WASHINGTON, D. C.

WILLIAM C. NORCROSS, 0F TERRE HAUTE, INDIANA.

ATTACHMENT FOR JOLT-RAMMING MOLDING-MACHINES.

Specification of Letters Patent.

Patented Sept. 16, 1919.

Application filed February'lO, 1919. Serial No. 276,136.

To all whom it may concern:

Be it known that I, lVILLIAM O. Noncnoss, a citizen of the United States, residing at Terre Haute, in the county of Vigo and State of Indiana, have invented certain new and useful Improvements in Attachments for Jolt Ramming Molding Machines, of which the followin is a specification.

This invention rglates to attachments for j olt-ramming molding machines.

The object of the present invention is the prevention or neutralization of the transmission from a jolt-ramming molding machine of secondary shocks or vibrations and, generally, to prevent the mold from receiving all possible recoils, vibrations, and movements other than such as will effect the settling or ramming of the sand in the mold.

The invention is designed, further, to prevent damage in some instances by the cracking of the mold after it has been rammed t0 the desired density.

The recoil, vibrations or reactions which are set up in jolt-ramming machines, particularly in those machines which have long tables, may become sufficiently violent to prevent rammin r or settling of sand in the mold and thus defeat the object of jolting the mold. In any jolt-ramming machine, even the smaller sizes, secondary shocks or vibrations have a tendency to prevent completion of the ramming action or to undo it. Secondary vibrations set up in the bars of the flask cause the sand to separate from the bars and drop away.

M invention consists in cushioning or shock-absorbing means located above the impact surfaces of a jolt-ramming machine for the purpose of absorbing the secondary recoils, vibrations, and movements due to the jolting action when the impact surfaces engage, thereby accomplishing the objects hereinbefore set forth.

M invention also consists in a cushion or shocii-absorber on top of the table of the jolt-ramming machine, said cushion or shock-absorber bein directly underneath the attern and mol In other words, the cushlon or insulation is interposed between the pattern and mold and the jolting table on which they are supported. A sheet of rubber, rubber fabric, cork matting, linoleum, spongy wood, or any other suitable material or cushion, whether merely a sheet, or specially formed, may be employed in carrying out my invention. The invention is not limited to use in connection with any particular jolt-ramming machine nor to the precise location specifiedbut it should be arranged above the impact surfaces of the inachine so that, while not interfering with the sharpness of the jolting action, it will, nevertheless, absorb secondary vibrations, recoils and movements. By way of illustration, the invention may be provided on the jolting table of the machines of any of my patents as, for instance, 1,194,059, August 8, 1916; 1,224,407, May 1, 1917; 1,245,955, November 6, 1917; 1,264,427, April 30, 1918; 1,274,752, August c, 1918.

The accompanying drawing'isa vertical section through one of my joltramming molding machines showing how the invention may be applied to the table thereof and the pattern plate, flask and mold supported thereon.

In the drawing the invention is shown applied to one of my jolt-ramming machines, but it is not limited to use in connection with any particular machine nor to being located precisely as shown. The base is shown at l, the cylinder at 2; jolting piston, 3, automatic valve, 4, and the jolting table appears at 5.

Heretofore the flask 6 and pattern plate 7 have rested directly upon the upper face of the jolting table 5. Secondary shocks or vibrations have heretofore been set up in the flask, the pattern plate, and in the bars (not shown) of the flask. As a result of the secondary shocks or vibrations, the work of rammlng the mold has been interfered with or undone and there has, in some instances, been a tendency to crack the mold after it has been rammed to the desired density; also, the bars of the flask have tended to cause the sand to separate from them and drop away. In the case of large tables, vibrations or reactions have been set up which have interfered seriously with the proper settling of the sand.

My object being to prevent the recoils, vibrations, reactions and other movements which will not contribute to the desired settling or ramming of the sand by the sudden or sheets, 8, placed in some suitable position above the impact surfaces of the machineand disposed at a point between the position of said impact surfaces and the mold flask or other material-container on theitable 5. One convenient embodiment of the invention is that showmwhere the cushion Sis located directly on the table 5 and forms an intermediatesupport for the flask, patternplate and mold. The flask, pattern plate and mold are thereby cushioned and when the arring action occurs due to the fall of the piston and table and theirfsudden arrest, secondary shocks, vibrations or reactions in the, flask, pattern plate, barsand mold, are prevented and the jarring action is a pr mary one which tends only to cause the sand to settle or ram in the mold.

I do not limit myself to, any particular cushion nor to the location-thereof in the position shown in the drawings..1 Sheet rubber, rubber fabric, or substances of alsimilar cushioning nature, cork matting, linoleum,

or spongy wood may beemployed. The

cushion may be otherwise disposedprovided it is above the impact surfaces of the jolting 1 machine.

What I claim is 1. A cushioning or shock absorbing attachment interposed between the table of a 'joltsra'mming machine and the flask, and

mold supported by said table.

2. The combination' with the table of the j olt-ramming machine and the pattern plate,

flask and mold supported thereby,-of a flat shock-absorbing cushion interposed between the table and the mold.

3. The method of preventing secondary vibrations, shocks, recoils. and reactions in the; mold material-while being rammed, consisting in imparting jolt; or jar to the; mold through an intermediate cushioning medium.

'4. A cushioning or shock v-fabsorbing attachment foiia jolt-ramming machine, lo-

cated in; .aposition between the. piston of such machine and the mold flask.

5. An attachment for a joltn'am ning ma- .,chine,located. above the impact surfaces of Goplu of this patent may be obtained 10;- five cents each, by addressing the Commissioner ofPatents.

' Washington, D. 0. 

